#include<stdio.h>

int main()
{	
	int num = 0,i = 0 ;
	printf("input a number :\n");
	scanf("%d",&num);

	for(i = 2; i * i <= num ; i ++){
		if(num % i == 0){
			printf("the number is not sushu !!\n");
			break;
		}
	}
	
	if(i * i > num)
		printf("the number is sushu !!\n");
	

	return 0;
}
